Originally Posted by
JimEli
FWIW
lead/lag at maximum
This photo nicely shows the damper, with unequal areas on either side of the piston, pushing the blade forward to the lead stop under hydraulic pressure so that a pitch lock can engage the pitch horn (visible on the left hand side of the image). There is no visible accumulator to compensate for changes in fluid volume with temperature, etc. but there is a hose leading off the damper, presumably to a central accumulator. May not be practical to design internal valving that would stop the system from draining from a damaged hose for every leak rate.
Blade fold is a necessary, but absolutely horrible thing for a rotor design.